Fish Pop calcs_10.22.09.xls

Author: Abt Associates Inc.

Created: 10/22/09

Worksheet Description

N. and Mid-Atlantic

estimates current fish pouplatioon size and maximum

population size based on available data and biomass

per fish conversion factors

Purpose: Estimate current fish population size and maximum fish population size based

on biomass maximum sustainable yield

File Info 1 of 13
Available Fish Biomass Data for Affected Species

Species Region Year

Comm&Rec

Landing Biomass

Original

Units Lbs

Conversion Factor (from

lbs to # of fish) # of fish Year

Spawning Stock

Biomass

Winter Flounder George's Bank 2005 2,200 mt 4,850,089 1.2 4,184,719 2005 4,324

Winter Flounder

Southern New EnglandMid Atlantic 2005 1,320 mt 2,910,054 1.2 2,510,831 2007 3,368

Winter Flounder Gulf of Maine 2006 550,000 lbs 550,000 1.2 474,547 2004 3,400

Summer Flounder Atlantic Coast 2007 19,970,000 lbs 19,970,000 2007 95,600,000

Atlantic Croacker Mid-Atlantic 2005 32,600,000 lbs 32,600,000 2004 80,000

Weakfish Atlantic Coast 2007 640 mt 1,410,935 3.4 418,365 2007 7,236

Striped Bass

Atlantic Coast (Maine to

N Carolina) 2004 15,164 mt 33,430,342 3.8 8,705,818 2004 24,900

Atlantic Cod Gulf of Maine 2005 3,909 mt 8,617,727 2.0 4,415,725 2004 20,549

**Spawning stock biomass (SSB) defined as "The

total weight of all sexually mature fish in the

population. This quantity depends on year class

abundance, the exploitation pattern, the rate of

growth, fishing and natural mortality rates, the

onset of sexual maturity and environmental

conditions." Source:

http://www.nefsc.noaa.gov/techniques/tech_terms

.html#tt14

N. and Mid-Atlantic 2 of 13
Available Fish Biomass Data for Affected Species

Species Region

Winter Flounder George's Bank

Winter Flounder

Southern New EnglandMid Atlantic

Winter Flounder Gulf of Maine

Summer Flounder Atlantic Coast

Atlantic Croacker Mid-Atlantic

Weakfish Atlantic Coast

Striped Bass

Atlantic Coast (Maine to

N Carolina)

Atlantic Cod Gulf of Maine

**Spawning stock biomass (SSB) defined as "The

total weight of all sexually mature fish in the

population. This quantity depends on year class

abundance, the exploitation pattern, the rate of

growth, fishing and natural mortality rates, the

onset of sexual maturity and environmental

conditions." Source:

http://www.nefsc.noaa.gov/techniques/tech_terms

.html#tt14

Original

Units Lbs

Conversion Factor (from

lbs to # of fish) # of fish Overfished?

Biomass Corr

to MSY

Original

Units

mt 9,532,630 1.2 8,224,874 no/yes 9,400 mt

mt 7,425,046 1.2 6,406,424 yes 38,761 mt

mt 7,495,592 1.2 6,467,292 no 4,100 mt

Total NA and MA pop 21,098,591

lbs 95,600,000 no 132,400,000 lbs

mt 176,366,880 no 28932 mt

mt 15,952,384 3.4 4,730,138 no 17009 mt

mt 54,894,191 3.8 14,295,362 no 17509 mt

mt 45,302,038 2.0 23,212,773 yes 82830 mt

N. and Mid-Atlantic 3 of 13
Available Fish Biomass Data for Affected Species

Species Region

Winter Flounder George's Bank

Winter Flounder

Southern New EnglandMid Atlantic

Winter Flounder Gulf of Maine

Summer Flounder Atlantic Coast

Atlantic Croacker Mid-Atlantic

Weakfish Atlantic Coast

Striped Bass

Atlantic Coast (Maine to

N Carolina)

Atlantic Cod Gulf of Maine

**Spawning stock biomass (SSB) defined as "The

total weight of all sexually mature fish in the

population. This quantity depends on year class

abundance, the exploitation pattern, the rate of

growth, fishing and natural mortality rates, the

onset of sexual maturity and environmental

conditions." Source:

http://www.nefsc.noaa.gov/techniques/tech_terms

.html#tt14

99.04047021

Note Bmsy (lbs) Bmsy (fish)

Minimum Biomass

Threshold

Percent of

Target

20,723,453 24,018,483 4,200 46

Bmsy previously 38761 based on ASMFC; adjusted to

30,100 based on NOAA NEFSC (2006) for consistency

among all stocks 85,453,377 99,040,470 9

9,038,953 10,476,147 83

Total 115,215,783 133,535,100 15.80%

66,200,000 72

20,252 277

13,108 43

14,016 142

25

N. and Mid-Atlantic 4 of 13
Available Fish Biomass Data for Affected Species

Species Region

Winter Flounder George's Bank

Winter Flounder

Southern New EnglandMid Atlantic

Winter Flounder Gulf of Maine

Summer Flounder Atlantic Coast

Atlantic Croacker Mid-Atlantic

Weakfish Atlantic Coast

Striped Bass

Atlantic Coast (Maine to

N Carolina)

Atlantic Cod Gulf of Maine

**Spawning stock biomass (SSB) defined as "The

total weight of all sexually mature fish in the

population. This quantity depends on year class

abundance, the exploitation pattern, the rate of

growth, fishing and natural mortality rates, the

onset of sexual maturity and environmental

conditions." Source:

http://www.nefsc.noaa.gov/techniques/tech_terms

.html#tt14

Units

Percent of

Threshold Source

% of BMSY 103 http://www.nefsc.noaa.gov/sos/spsyn/fldrs/winter/

% of SSBMSY

http://www.nefsc.noaa.gov/sos/spsyn/fldrs/winter/ ;

http://www.asmfc.org/speciesDocuments/winterFlounder/

winterFlounderProfile.pdf

% of BMSY http://www.nefsc.noaa.gov/sos/spsyn/fldrs/winter/

% of SSBMSY 144

http://www.asmfc.org/speciesDocuments/sfScupBSB/su

mmerflounder/sFlounderProfile.pdf

% of SSBMSY 395 http://www.asmfc.org/

% of SSBMSY 55

http://www.nefsc.noaa.gov/SAW-Public/SARC-48-

pdfs/Weakfish/new/Old-C2-Weakf2009%20Assess%20Summ%20Rpt-5%2018%2009.pdf

% of SSBMSY 178 http://www.nefsc.noaa.gov/sos/spsyn/af/sbass/

% of SSBMSY http://www.nefsc.noaa.gov/sos/spsyn/pg/cod/

N. and Mid-Atlantic 5 of 13
Species Region Year

Comm&Rec

Landing Biomass

Original

Units Lbs

Conversion Factor (from

lbs to # of fish) # of fish Year

Spawning Stock

Biomass

Atlantic Cod

George's Bank and

Areas to South 2005 3,048 mt 6,719,578 2.0 3,443,113 2004 22,564

Atlantic Mackerel

Northwest Atlantic

between Labrador and

North Carolina 2004 54,191 mt 119,468,720 0.7 169,051,511 2004 2,300,000

Additional Species (Not in

Report)

Atlantic Herring

Gulf of Maine - George's

Bank and Scotian Shelf 2005 109,000 mt 240,299,874 2006 1,040,000

Atlantic Menhaden

Atlantic Coast (FL to

Nova Scotia) 2005 185,100 mt 408,068,869

Bluefish Atlantic Coast 2005 10,400 mt 22,927,694 1.978199085 11,590,186 2004 104,136

Spanish Mackerel Atlantic Coast 2004 5,500,000 lbs 5,500,000 2001-2002 24,000,000

American Plaice

Gulf of Maine to George's

Bank 2004 1,711 mt 3,772,047 2004 14,149

Atlantic Butterfish

(aka American Butterfish)

Atlantic Coast (Gulf of

Maine to Cape Hatteras) 2005 432 mt 952,381 0.663100255 1,436,255 2002 8,700

Spiny Dogfish

Western North Atlantic

from Labrador to Florida 2005 1,100 mt 2,425,045 2006 106,000

Tilefish

Nova Scotia to South

America (abundant from

southern New Eng. to

Mid-Atalantic) 2004 1,215 mt 2,678,572 2005 6,768

White Hake

Newfoundland to

Southern New England 2004 3,600.00 mt 7,936,510 2004 3.01

N. and Mid-Atlantic 6 of 13
Species Region

Atlantic Cod

George's Bank and

Areas to South

Atlantic Mackerel

Northwest Atlantic

between Labrador and

North Carolina

Additional Species (Not in

Report)

Atlantic Herring

Gulf of Maine - George's

Bank and Scotian Shelf

Atlantic Menhaden

Atlantic Coast (FL to

Nova Scotia)

Bluefish Atlantic Coast

Spanish Mackerel Atlantic Coast

American Plaice

Gulf of Maine to George's

Bank

Atlantic Butterfish

(aka American Butterfish)

Atlantic Coast (Gulf of

Maine to Cape Hatteras)

Spiny Dogfish

Western North Atlantic

from Labrador to Florida

Tilefish

Nova Scotia to South

America (abundant from

southern New Eng. to

Mid-Atalantic)

White Hake

Newfoundland to

Southern New England

Original

Units Lbs

Conversion Factor (from

lbs to # of fish) # of fish Overfished?

Biomass Corr

to MSY

Original

Units

mt 49,744,279 2.0 25,488,978 yes 217000 mt

mt 5,070,547,800 0.7 7,174,964,003 no 644000 mt

mt 2,292,769,440 no 629000 mt

no

mt 229,576,768 1.978199085 116,053,419 no 147052 mt

fish no

mt 31,192,687 yes 28600 mt

mt 19,179,898 0.663100255 28,924,583 22798 mt

mt 233,686,116 no

no target

currently

in place

mt 14,920,638 no 9400 mt

kg/tow yes 7.7 kg/tow

N. and Mid-Atlantic 7 of 13
Species Region

Atlantic Cod

George's Bank and

Areas to South

Atlantic Mackerel

Northwest Atlantic

between Labrador and

North Carolina

Additional Species (Not in

Report)

Atlantic Herring

Gulf of Maine - George's

Bank and Scotian Shelf

Atlantic Menhaden

Atlantic Coast (FL to

Nova Scotia)

Bluefish Atlantic Coast

Spanish Mackerel Atlantic Coast

American Plaice

Gulf of Maine to George's

Bank

Atlantic Butterfish

(aka American Butterfish)

Atlantic Coast (Gulf of

Maine to Cape Hatteras)

Spiny Dogfish

Western North Atlantic

from Labrador to Florida

Tilefish

Nova Scotia to South

America (abundant from

southern New Eng. to

Mid-Atalantic)

White Hake

Newfoundland to

Southern New England

Note Bmsy (lbs) Bmsy (fish)

Minimum Biomass

Threshold

Percent of

Target

10

357

314,500 165

324,194,166 641,320,602 73,526 71

49

38

100,000

72

3.35 39

N. and Mid-Atlantic 8 of 13
Species Region

Atlantic Cod

George's Bank and

Areas to South

Atlantic Mackerel

Northwest Atlantic

between Labrador and

North Carolina

Additional Species (Not in

Report)

Atlantic Herring

Gulf of Maine - George's

Bank and Scotian Shelf

Atlantic Menhaden

Atlantic Coast (FL to

Nova Scotia)

Bluefish Atlantic Coast

Spanish Mackerel Atlantic Coast

American Plaice

Gulf of Maine to George's

Bank

Atlantic Butterfish

(aka American Butterfish)

Atlantic Coast (Gulf of

Maine to Cape Hatteras)

Spiny Dogfish

Western North Atlantic

from Labrador to Florida

Tilefish

Nova Scotia to South

America (abundant from

southern New Eng. to

Mid-Atalantic)

White Hake

Newfoundland to

Southern New England

Units

Percent of

Threshold Source

% of SSBMSY http://www.nefsc.noaa.gov/sos/spsyn/pg/cod/

% of SSBMSY http://www.nefsc.noaa.gov/sos/spsyn/pp/mackerel/

% of SSBMSY 331 http://www.nefsc.noaa.gov/sos/spsyn/pp/herring/

http://www.asmfc.org/speciesDocuments/menhaden/men

hadenProfile.pdf

% of BMSY 142 http://www.nefsc.noaa.gov/sos/spsyn/op/bluefish/

http://www.asmfc.org/speciesDocuments/southAtlanticSp

ecies/spanishmackerel/speciesProfile0704.pdf

% of SSBMSY http://www.nefsc.noaa.gov/sos/spsyn/fldrs/plaice/

% of BMSY http://www.nefsc.noaa.gov/sos/spsyn/op/butter/

106 http://www.nefsc.noaa.gov/sos/spsyn/op/dogfish/

% of BMSY http://www.nefsc.noaa.gov/sos/spsyn/og/tile/

% of BMSY 90 http://www.nefsc.noaa.gov/sos/spsyn/og/hake/

N. and Mid-Atlantic 9 of 13
Species Region Year

Comm&Rec

Landing Biomass

Original

Units Lbs

Conversion Factor (from

lbs to # of fish) # of fish Year

Spawning Stock

Biomass

Redfish

(aka Acadian redfish)

Gulf of Maine, George's

Bank, and Great South

Channel 2005 600 mt 1,322,752 2004 175,800

Yellowtail Flounder George's Bank 2005 4,200 mt 9,259,261 2005 5,400

Yellowtail Flounder Cape Cod/Gulf of Maine 2005 700 mt 1,543,210 2004 1,000

Yellowtail Flounder

Southern New

England/Mid-Atlantic 2005 100 mt 220,459

Witch Flounder (Gray Sole)

Gulf of Maine - George's

Bank to Cape Hatteras 2005 2,600 mt 5,731,924 2004 21,175

Spotted Seatrout Maryland to FL

N. and Mid-Atlantic 10 of 13
Species Region

Redfish

(aka Acadian redfish)

Gulf of Maine, George's

Bank, and Great South

Channel

Yellowtail Flounder George's Bank

Yellowtail Flounder Cape Cod/Gulf of Maine

Yellowtail Flounder

Southern New

England/Mid-Atlantic

Witch Flounder (Gray Sole)

Gulf of Maine - George's

Bank to Cape Hatteras

Spotted Seatrout Maryland to FL

Original

Units Lbs

Conversion Factor (from

lbs to # of fish) # of fish Overfished?

Biomass Corr

to MSY

Original

Units

mt 387,566,219 no 236700 mt

mt 11,904,764 yes 58800 mt

mt 2,204,586 yes 12600 mt

yes 64500 mt

mt 46,682,109 no 25248 mt

yes

N. and Mid-Atlantic 11 of 13
Species Region

Redfish

(aka Acadian redfish)

Gulf of Maine, George's

Bank, and Great South

Channel

Yellowtail Flounder George's Bank

Yellowtail Flounder Cape Cod/Gulf of Maine

Yellowtail Flounder

Southern New

England/Mid-Atlantic

Witch Flounder (Gray Sole)

Gulf of Maine - George's

Bank to Cape Hatteras

Spotted Seatrout Maryland to FL

Note Bmsy (lbs) Bmsy (fish)

Minimum Biomass

Threshold

Percent of

Target

74

29,400 9

8

84

Atlantic Coast Mean 84

N. Atlantic Mean 61

Mid-Atlantic Mean 104

N. and Mid-Atlantic 12 of 13
Species Region

Redfish

(aka Acadian redfish)

Gulf of Maine, George's

Bank, and Great South

Channel

Yellowtail Flounder George's Bank

Yellowtail Flounder Cape Cod/Gulf of Maine

Yellowtail Flounder

Southern New

England/Mid-Atlantic

Witch Flounder (Gray Sole)

Gulf of Maine - George's

Bank to Cape Hatteras

Spotted Seatrout Maryland to FL

Units

Percent of

Threshold Source

% of BMSY http://www.nefsc.noaa.gov/sos/spsyn/pg/redfish/#tab1

% of BMSY 18 http://www.nefsc.noaa.gov/sos/spsyn/fldrs/yellotail/

% of BMSY http://www.nefsc.noaa.gov/sos/spsyn/fldrs/yellotail/

http://www.nefsc.noaa.gov/sos/spsyn/fldrs/yellotail/

% of SSBMSY http://www.nefsc.noaa.gov/sos/spsyn/fldrs/witch/

http://www.asmfc.org/

%

%

%

N. and Mid-Atlantic 13 of 13